package com.mmall.util;

import java.security.MessageDigest;

/**
 * @Author: Czh
 * @Date: 2019/4/1  14:16
 * @Version: 1.0
 **/
public class MD5Util {

        private static String byteArrayToHexString(byte b[]) {
            StringBuffer resultSb = new StringBuffer();
            for (int i = 0; i < b.length; i++)
                resultSb.append(byteToHexString(b[i]));

            return resultSb.toString();
        }

        private static String byteToHexString(byte b) {
            int n = b;
            if (n < 0)
                n += 256;
            int d1 = n / 16;
            int d2 = n % 16;
            return hexDigits[d1] + hexDigits[d2];
        }

        /**
         * 返回大写MD5
         *
         * @param origin
         * @param charsetname
         * @return
         */
        private static String MD5Encode(String origin, String charsetname) {
            String resultString = null;
            try {
                resultString = new String(origin);
                MessageDigest md = MessageDigest.getInstance("MD5");
                if (charsetname == null || "".equals(charsetname))
                    resultString = byteArrayToHexString(md.digest(resultString.getBytes()));
                else
                    resultString = byteArrayToHexString(md.digest(resultString.getBytes(charsetname)));
            } catch (Exception exception) {
            }
            return resultString.toUpperCase();
        }

        public static String MD5EncodeUtf8(String origin) {
            origin = origin + PropertiesUtil.getProperty("password.salt", "");
            return MD5Encode(origin, "utf-8");
        }


        private static final String hexDigits[] = {"0", "1", "2", "3", "4", "5",
                "6", "7", "8", "9", "a", "b", "c", "d", "e", "f"};

    }

